Pulley construction



March 1 8, 1930;

w. D. l-lAMERswunA PULLEY ooNsTRUCT'IoNA Filed Aug. 26,' 1927 A TTORNEYS.

Patented Mar. 18, 1930 UNITED STATES PATENT OFFICE WILLIAM D. HAMERSTADT, 0F INDIANAPOLIS, INDIANA, ASSIGNOR TO ROCKWOOD MANUFACTURING COMPANY, OF INDIANAPOLIS, INDIANA, A CORPORATION PULLEY CONSTRUCTION Application filed August 26,1927.

This invention relates to pulleys commonly called paper pulleys. n

The chief object of the invention is to improve the construction of pulleys of the general character shown in the priorrPatent No. 1,542,125, dated June 16, 1925.

The chief feature of the invention consists in the formation of the median portion of the pulley and the process of forming the same, whereby pulleys can be produced in a simpler manner than shown in the beforementioned patent and which has the added advantage of being more suitable to the production of relatively large diameter pulleys. It has been determined that one-third of the Weight of the pulley can be eliminated by the employment of the present construction in relatively large size pulleys without in any way affecting the capacity of the pulley or its operation. Furthermore, in addition to affecting saving in weight, the present construction consists of a relatively simplified arrangement, details of which will appear more fully hereinafter. p

The full nature of the invention will be understood from the accompanying drawings and the kfollowing description and claims: l

In the .drawings Fig. 1 is a side elevation of a metal spidered paper pulley. Fig. 2 is a transverse section taken on line 2-2 of Fig. 1 and in the direction of the arrows. Fig. 3 is a transverse section of a portion of the median section of a pulley and represents the completion of the same.

In the drawings 10 indicates a conventional hub and projecting radially therefrom are the spoke arms 11 which herein are shown of steel and riveted to the hub altho they may be otherwise mounted. Each steel arm 11 has an aperture 12 in its outer end and the apertures 12 of each pair of arms register with each other. Mounted between the projecting ends of the arms are a plurality of annular rings or laminations of so called paper board stock commonly employed in the manufacture of paper pulleys, and herein said central laminations are indicated by the numeral 13. They are apertured at 14. Positioned in the registering apertures Serial No. 215,611.

parts 16 of the dies are forced toward each Y other, the laminations 13 are compressed into a single rigid mass and simultaneously there# with the ends ofthe tubular bushing 15 are upset as at 19. rThe body portion of the bushing is pressed inwardly, which causes the bushing to partially deform, and its exterior 21 thus has an irregular firm anchorage in the laminations 13. The dotted lines 22 `in Fig. 2 show the initial assembly of the median laminations 13, spider arms 12 and the bushings 15 prior to assembly. Y y

The foregoing construction not only serves to form a driving unit with the arm included laminations, but also secures a construction wherein the fibre of the board is condensed forming a stronger pulley. Diifering from the pulley in the before-mentioned patent, the driving is entirely through the medium of the central rigidly united section or annular laminations 13 of paper pulley. v

The remainder of the pulley comprises a plurality of side laminations 23 apertured at24 to receive the dowels 25 and anchored to said dowels at each end are the washers 26 by means of the screw nails 25 or equivalent means. It will be understood that the dowels 25 not only extend through the tube 15 but also extend through the annular laminations 13 and 23 at points such as at '30, see Fig. 1, wherein there is no tube or anchoring arm. A tight drive fit between the dowel 25 and the enclosing bushing 15 is not required since by the aforesaid rigid or unitary median portion of the pulley the same constitutes the driving portion and through all of the dowels the driving force is imparted' to the remainder of the pulley such as the end laminations 23. The central portion also sin constitutes the supporting portion for the remainder of the pulley, that is, the side sections or those not immediately connected to the spider arms.

It will be apparent from the foregoing that a great load relatively can be transmitted by the aforesaid construction since the median section is rigid with the driving arms and the median section supports the reinainder of the pulley and drives the same through all of the dowels. It has beenV determined in one instance of a commercial pulley of about two feet in diameter that the weight of the pulley has been reduced from 90 to 30 pounds without in any way ailecting the transmitting power capacity of the puls ley or affecting the life thereof.

The invention claimed is:

l. In a paper pulley and the like, the combination of a hub, a rigid annular driving and supporting portion concentric therewith comprising a plurality of compressed laminations retained under compression, a plurality of pairs of supporting arms connecting the hub to the annular portion, said arms being paired, and each pair including laniinations therebetween, and means uniting each pair of arms together for retaining the laminations in compressed relation.

2. A device as defined by claim l, characterized by the paired arms being positioned opposite each other in lamination straddling relation and the arm uniting means entending through the arms and the laminations and having enlarged ends bearing on the arm eXteriors. V

3. In a paper pulley and the like, the combination of a hub, a rigid annular driving and supporting portion concentric therewith comprising a plurality of compressed laminations retained under compression, a plurality of pairs of supporting arms connecting the hub to the annular portion, said arms being paired, and each pair including laminations therebetween, means uniting each pair of arms together for retaining the laminations therebetween in compressed relation, a laterally projecting pulley rim forming portion composed of laminations, and dowels extending through all of the laminations for uniting the portions and laminations together for support and driving.

4. A device as defined by claim 8, chars acterized by the paired arms being positioned opposite each other in lamination straddling relation and the arm uniting means extending through the arms including the laminations and having enlarged ends bearing on the arm exteriors.

5. A device as defined by claim 3, characterized by the paired arms being positioned opposite each other in lamination straddling relation and the arm uniting means extending through the arms including the laminations and having enlarged ends bearingon the arm exteriors, said arm uniting means being tubular and certain of said dowels extending therethrough and projecting beyond said tubular arm uniting means and into the adjacent laminations.

6. A process of 'forming paper pulleys, including positioning a plurality of apertured laminations between apertured arms with the apertures registering, positioning a tubun lar support in the apertures, compressing the laminations between said arms, and stoving the tubular support over the arms to simultaneously lock the laminations to the support in compressed relation and to permanently connect the laminations and the arms together.

7. A process as defined by claim 6, characterized by the compressionv of the lamina tions and the uniting of the support to the arms occurring progressively and as a continuous operation.

8. A paper pulley and the like having a. hub, pairs of spoke members secured to the hub with the members of each pair spaced apart transversely of the pulley, a main laminated driving and supporting rim portion compressed and secured between the outer ends of said pairs of spoke members, an additional rim portion beside said main driving and supporting rim portion, and dowels carried by said main rim portion which secures said additional rim portion thereto.

9. A paper pulley including a hub, spoke members secured to the hub and arranged in pairs with the members of each pair spaced away from each other transversely of the pulley and having registering holes in the outer ends of every pair of spoke members, a main rim portion formed of annular laminations compressed together between the outer portions of the spoke members, a metal tube extending thru each pair of spoke members and the rim portion between them with means on the ends of said tube for tightly compressing the spoke members and said rim portion together, annular laminated rim portions beside said main rim and dowels extending thru said rim portions and tubes for securing said additional rim portions to said main rim portion.

In witness whereof,I have hereunto affixed my signature.

lVILLIAM D. HAHERSTADT. 

